Tonight sees the return of the 2013 Copa Libertadores with the first semi-final between Olimpia Asuncion and Independiente Santa Fe.

Both sides topped their respective groups in the earlier stages of the tournament. Santa Fe seen off Gremio on goal difference before emphatically eliminating Real Garcilaso 5-1 over two legs. Olimpia knocked out Copa Sudamericano finalists Tigre in the Final 16 before defeating Brasileiro champions Fluminense in the Quarter-Finals. Despite getting this far, it is the winner of the other semi-final, Newell’s versus Atletico Mineiro, who is expected to be the clear favourite for the Copa Libertadores Final. It would however be foolish to write-off either off these two sides and Olimpia in particular have a very rich history in this tournament, having already won it three times (most recently in 2002).

Wednesday night’s match in the Copa Libertadores between Atlético Mineiro and Arsenal de Sarandi gave us a little bit of everything – beautiful goals, controversy and even some drama at the very end. It was a game that cemented the Brazilian side’s claim to be looked upon as one of the favourites now for this tournament. Atlético Mineiro have won 12 games in a row now and hold a 100% record in this year’s Copa Libertadores so far.

Tonight we saw the first leg of the Copa Libertadores final between Boca Juniors and Corinthians. As ever, the competition this season has been another drama filled spectacle, swinging from the sublime to the ridiculous. Here are some of the most memorable moments of the knock-out rounds so far.

Universidad de Chile and Santos Mesmerize us in the last 16: Chilean giants Universidad de Chile and last season’s Copa Libertadores winners Santos both struggled badly in the first leg away ties of the last 16. Both teams were playing away at clubs in the highest capital cities of the world: Bolivar in La Paz (Bolivia) and Deportivo Quito in Quito (Ecuador). Altitude is often a major factor in these Copa Libertadores ties.